Air compressor or pump



Oct. 7, 1958 J. SZCZEPANEK 2,854,928

AIR COMPRESSOR OR PUMP Original Filed April 21, 1955 f/wE/v me Jon/v 52:2 EPHNEK y WW 75 WW United States Patent Ofiice 2,854,928 l ate'ntedOct. 7, 1958 AIR COMPRESSOR R PUMP John Szczepanek, Chicago, Ill.

Original application April 21, 1955, Serial No. 502,981,

now Patent No. 2,788,748, dated April 16, 1957. Divided and thisapplication June 5, 1956, Serial No.

2 Claims. (Cl. 103-423) My invention relates to improvements in aircompressors, pumps or similar devices.

This application is a division of my presently pending applicationSerial No. 502,981, filed April 21, 1955, now issued as U. S. Patent No.2,788,748 on April 16, 1957. My invention relates more particularly toimprovements in the construction of devices of this type wherein theparts are generally greatly simplified and the efficiency of thesimplified construction is very high.

While the construction which will be explained and described is directedparticularly to small or portable types of compressors or pumps such asare used for paint spray guns, etc., it will be understood that theinvention is not so limited, and the size or capacity of theconstruction is not restricted to the details of construction which willbe shown.

The principal object of the present invention is to provide an improvedair compressor or pump construction.

A further object is to provide such construction with a minimum ofmoving parts, yet which will function in a highly efiicient manner forthe purpose desired.

A further object of the invention is to provide a. compressor or pump ofthe type described that has an improved valve construction.

A further object is to provide a comparatively frictionless cooperationof rotor and valve in a construction of the type described therebyinsuring long life and high efliciency.

A further object of the invention is to provide a compressor or pump ofthe type described that is easily and cheaply made and one which willgive long and hard service without becoming broken or out of order.

Other objects and advantages will be more apparent from the followingdescription wherein reference is had to the accompanying drawings, uponwhich:

Fig. 1 is a cross-sectional view of a compressor or pump constructionwherein an air compressor is employed to assist in operating the valveplate;

Fig. 2 is a transverse cross-sectional View thereof taken on the line2--2 of Fig. 1; and

Fig. 3 is a fragmentary sectional view thereof taken on the line 3-3 ofFig. 2.

In the embodiment of the invention which I have chosen to illustrate anddescribe, I have shown a construction wherein I provide the rotorhousing 76 having a chamber 78 Within which the ofiset rotor 80 ismounted, the rotor being driven by a shaft 82 from a desired source ofpower.

The housing has an inlet conduit 84 connected to a suitable bore 88which connects with the chamber 78 upon one side of a verticallydisposed valve plate 12. The driving shaft 82, as best shown in Fig. 2,may be provided with thrust or end bearings 83 and 85 located insuitable cavities in side wall 69 and end plate 67 of the housing 76.The housing 76 may include an end plate 67 fastened thereto by suitablescrew members and enclosing a sealing wire 63 located in suitablesemicylindrical grooves 61 and 59 in the housing 76 and the end plate 67respectively.

This construction is preferable when the housing and cover plate aremade of comparatively soft aluminum, so that an effective seal will bemaintained about the chamber 78 by reason of the wire sealing memberembedded in its position between the two facing surfaces of these parts.As can be seen in Fig. 3, the sealing wire 63 has its ends 63a and 63babutting the sides of the valve plate 12.

The reciprocating valve which I prefer to employ in this construction iscomparatively light, being made of a linen fiber of the type of whichgears and other similar parts have been made, the fibers beingcomparatively tough so that the wearing qualities of this material arevery good. Accordingly, I provide the valve plate 12 generallyrectangular in shape, having the lower arcuately shaped face 14 whichrides upon the periphery of the rotor 80. The radius of the face 14 ispreferably much larger than the radius of the rotor so that at all timesa tangential contact at only one point is maintained. The valve plate 12is adapted to reciprocate in a suitable passageway 16 on the valve platehousing 18, the plate having a pin member 20 extending upwardlytherefrom and through a suitable opening 22 in the top wall of the valvehousing. The pin is provided with a head 24 so that the valve 12 may bemanually raised and lowered when desired, especially for priming or instarting the compressor or pump.

I have provided a construction wherein air pressure is utilized to forcethe valve plate in sealing position against the periphery of the rotor80. This may include the outlet passageway 26 and the ball check valve28 which normally seals the same. Check valve 28 may be aligned with avertical passageway 30 in the valve housing 18, the passageway 30communicating with a passageway 32 at the top of the valve housing whichhas a port opening into the valve passageway 16, and a spring-pressedcheck valve 34 closing the other end of the same. An outlet passageway36 is aligned with the check valve 34.

In the operation of the compressor above described, as the compressor isforcing air under pressure through the passageway 30, pressure will bebuilt up in the valve passageway 16 so that as the rotor rotates to theposition shown in Fig. 1, pressure on top of the valve plate willnormally tend to hold the same in frictional contact with the rotor.This action is thus obtained without the use of springs or any otherdirect or other connection between the valve plate and the rotor, theconstruction serving to function solely due to the pressure that will bebuilt up in the passageways 30, 32 and 16 between the check valves 28and 34. In view of the fact that there is a possibility that thispressure will diminish during rest periods of the rotor, the priming pin20 has been provided for starting the operation of the mechanism.

While I have illustrated and described a specific embodiment of theinvention, it will be apparent to those skilled in the art that changesand modifications may be made in the exact details shown, and I donotwish to be limited in any particular; rather what I desire to secureand protect by Letters Patent of the United States is:

1. The combination of a housing having a cylindrical rotor chambertherein, a cylindrically shaped rotor mounted in said chamber, a driveshaft extending therefrom, said drive shaft axially mounted in saidchamber, said rotor eccentrically mounted thereon, a valve chamber abovesaid rotor chamber, a vertically reciprocal rectangularly shaped platevalve mounted above said rotor in said valve chamber, an inlet conduitin said housing to said rotor chamber on one side of said plate,

an outlet conduit in said housing to said rotor chamber on the otherside of said plate, spring pressed check valves in said outletpassageway, and a passageway in said,housingbetweensaid check. valvesconnecting said outlet passage with said valve chamber wherebypressurein saidv outlet passageway .forces .said valve. plate into engagementwith said rotor.

2. The. combination of a housing having acylindrical rotor chamber.therein, a cylindrically shaped rotor mounted in saidchamber, saidchamberhaving a removable sidewall and an integral side wall, a driveshaft extending from said rotor through an opening in said integralwall, a bearing in both said removable wall and said integral wallforsaid .shaft, said housing having a circular. sealing ring generallysurrounding the chamber therein andin contact with the inside of saidremovable wall, said drive shaft axially mounted with respect to saidchambensaid rotor eccentrically mounted on said shaft, a valve chamberin said housing, a vertically reciprocal rectangularly shaped platevalve mounted in said valve chamber above said rotor said valve chamberhaving an opening therein above said plate valve, a priming pinconnected to the top of said plate valve and extending upwardly throughsaid opening, an inlet conduit in said housing to said rotor chamber onone side of said plate, an outlet conduit 'in said housing to said rotorchamber on the other side of said plate, spring pressed check valves insaid outlet passageway, and a passageway between said check valvesconnecting said outlet passage with the valve plate chamber wherebypressure in said outlet passageway forces said valve plate intoengagement-with said rotor.

References Cited in the file of this patent UNITED STATES PATENTS1,890,571 Dubrovin Dec. 13, 1932 1,890,573 Dubrovin Dec. 13, 19321,949,710 Dubrovin Mar. 6, 1934 1,997,725 Gaede Apr. 16, 1935 2,191,172Lisowski Feb. 20, 1940 2,340,196 Magrum et a1. Jan. 25, 1944 2,373,457Chisholm Apr.v 10, 1945 2,706,452 Hilton Apr. 19, 1955 2,758,548Rockwell Aug. 14, 1956 2,788,748 Szczepanek Apr. 16, 1957 FOREIGNPATENTS 1,005,203 France Dec. 12, 1951

